/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 464 by jonathan, Wed Mar 5 18:17:47 2003 UTC revision 725 by jonathan, Thu Apr 24 16:05:36 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
 import os  
11  from math import log, ceil  from math import log, ceil
12    
13  from Thuban import _  from Thuban import _
14    
15  import shapelib, shptree  import shapelib, shptree
16    
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
18       LAYER_VISIBILITY_CHANGED       LAYER_CHANGED
19    
20  from color import Color  from color import Color
21    
22  import classification  import classification
23    
 from table import Table  
   
24  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
25    
26    
27  class Shape:  class Shape:
28    
29      """Represent one shape"""      """Represent one shape"""
# Line 102  class Layer(BaseLayer): Line 100  class Layer(BaseLayer):
100    
101          TITLE_CHANGED -- The title has changed.          TITLE_CHANGED -- The title has changed.
102          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
         LAYER_LEGEND_CHANGED -- the fill or stroke attributes have changed  
   
103      """      """
104    
105      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
106                   fill = Color.None,                   fill = Color.Transparent,
107                   stroke = Color.Black,                   stroke = Color.Black,
108                   lineWidth = 1,                   lineWidth = 1,
109                   visible = 1):                   visible = 1):
110          """Initialize the layer.          """Initialize the layer.
111    
112          title -- the title          title -- the title
113          filename -- the name of the shapefile          data -- datastore object for the shape data shown by the layer
114          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
115                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
116                 coordinates                 coordinates
117          fill -- the fill color or Color.None if the shapes are not filled          fill -- the fill color or Color.Transparent if the shapes are
118          stroke -- the stroke color or Color.None if the shapes are not stroked                  not filled
119            stroke -- the stroke color or Color.Transparent if the shapes
120                    are not stroked
121          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
122    
123          colors are expected to be instances of Color class          colors are expected to be instances of Color class
124          """          """
125          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title, visible = visible)
126    
         # Make the filename absolute. The filename will be  
         # interpreted relative to that anyway, but when saving a  
         # session we need to compare absolute paths and it's usually  
         # safer to always work with absolute paths.  
         self.filename = os.path.abspath(filename)  
   
127          self.projection = projection          self.projection = projection
         self.shapefile = None  
         self.shapetree = None  
         self.open_shapefile()  
         # shapetable is the table associated with the shapefile, while  
         # table is the default table used to look up attributes for  
         # display  
         self.shapetable = Table(filename)  
         self.table = self.shapetable  
128    
129          self.__classification = classification.Classification(self)          #
130            # this is really important so that when the classification class
131            # tries to set its parent layer the variable will exist
132            #
133            self.__classification = None
134            self.__setClassLock = False
135    
136            self.SetShapeStore(data)
137    
138            self.SetClassification(None)
139    
140          self.__classification.SetDefaultLineColor(stroke)          self.__classification.SetDefaultLineColor(stroke)
141          self.__classification.SetDefaultLineWidth(lineWidth)          self.__classification.SetDefaultLineWidth(lineWidth)
142          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
143            self.__classification.SetLayer(self)
144    
145          self.UnsetModified()          self.UnsetModified()
146    
     def open_shapefile(self):  
         if self.shapefile is None:  
             self.shapefile = shapelib.ShapeFile(self.filename)  
             numshapes, shapetype, mins, maxs = self.shapefile.info()  
             self.numshapes = numshapes  
             self.shapetype = shapelib_shapetypes[shapetype]  
   
             # if there are shapes, set the bbox accordinly. Otherwise  
             # set it to None.  
             if self.numshapes:  
                 self.bbox = mins[:2] + maxs[:2]  
             else:  
                 self.bbox = None  
   
             # estimate a good depth for the quad tree. Each depth  
             # multiplies the number of nodes by four, therefore we  
             # basically take the base 4 logarithm of the number of  
             # shapes.  
             if self.numshapes < 4:  
                 maxdepth = 1  
             else:  
                 maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))  
147    
148              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,      def SetShapeStore(self, store):
149                                               maxdepth)          self.store = store
150            self.shapefile = self.store.Shapefile()
151            self.shapetable = self.store.Table()
152            self.filename = self.store.filename
153            self.table = self.shapetable
154    
155            numshapes, shapetype, mins, maxs = self.shapefile.info()
156            self.numshapes = numshapes
157            self.shapetype = shapelib_shapetypes[shapetype]
158    
159            # if there are shapes, set the bbox accordingly. Otherwise
160            # set it to None.
161            if self.numshapes:
162                self.bbox = mins[:2] + maxs[:2]
163            else:
164                self.bbox = None
165    
166            # estimate a good depth for the quad tree. Each depth
167            # multiplies the number of nodes by four, therefore we
168            # basically take the base 4 logarithm of the number of
169            # shapes.
170            if self.numshapes < 4:
171                maxdepth = 1
172            else:
173                maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
174    
175            self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
176                                             maxdepth)
177            if self.__classification is not None:
178                fieldname = self.__classification.GetField()
179                if not self.store.Table().field_info_by_name(fieldname):
180                    self.SetClassification(None)
181            self.changed(LAYER_CHANGED, self)
182    
183        def ShapeStore(self):
184            return self.store
185    
186      def Destroy(self):      def Destroy(self):
187          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
188          if self.shapefile is not None:          self.SetClassification(None)
             self.shapefile.close()  
             self.shapefile = None  
             self.shapetree = None  
         self.table.Destroy()  
189    
190      def BoundingBox(self):      def BoundingBox(self):
191          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
192    
193          If the layer has no shapes, return None.          If the layer has no shapes, return None.
194          """          """
         # The bbox will be set by open_shapefile just as we need it  
         # here.  
         self.open_shapefile()  
195          return self.bbox          return self.bbox
196    
197      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
# Line 209  class Layer(BaseLayer): Line 210  class Layer(BaseLayer):
210              return None              return None
211    
212      def GetFieldType(self, fieldName):      def GetFieldType(self, fieldName):
         self.open_shapefile()  
213          info = self.table.field_info_by_name(fieldName)          info = self.table.field_info_by_name(fieldName)
214          if info is not None:          if info is not None:
215              return info[0]              return info[0]
# Line 218  class Layer(BaseLayer): Line 218  class Layer(BaseLayer):
218    
219      def NumShapes(self):      def NumShapes(self):
220          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
221          return self.numshapes          return self.numshapes
222    
223      def ShapeType(self):      def ShapeType(self):
224          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
225          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
226          """          """
         self.open_shapefile()  
227          return self.shapetype          return self.shapetype
228    
229      def Shape(self, index):      def Shape(self, index):
230          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
231          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
232    
233          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
# Line 253  class Layer(BaseLayer): Line 250  class Layer(BaseLayer):
250          left, bottom, right, top = box          left, bottom, right, top = box
251          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
252    
253        def GetProjection(self):
254            return self.projection
255    
256      def SetProjection(self, projection):      def SetProjection(self, projection):
257          """Set the layer's projection"""          """Set the layer's projection"""
258          self.projection = projection          self.projection = projection
# Line 262  class Layer(BaseLayer): Line 262  class Layer(BaseLayer):
262          return self.__classification          return self.__classification
263    
264      def SetClassification(self, clazz):      def SetClassification(self, clazz):
265          self.__classification = clazz          """Set the classification to 'clazz'
         self.changed(LAYER_LEGEND_CHANGED, self)  
266    
267            If 'clazz' is None a default classification is created
268            """
269    
270            # prevent infinite recursion when calling SetLayer()
271            if self.__setClassLock: return
272    
273            self.__setClassLock = True
274    
275            if clazz is None:
276                if self.__classification is not None:
277                    self.__classification.SetLayer(None)
278                self.__classification = classification.Classification()
279            else:
280                self.__classification = clazz
281                try:
282                    self.__classification.SetLayer(self)
283                except ValueError:
284                    self.__setClassLock = False
285                    raise ValueError
286    
287            self.changed(LAYER_CHANGED, self)
288    
289            self.__setClassLock = False
290    
291        def ClassChanged(self):
292            """Called from the classification object when it has changed."""
293            self.changed(LAYER_CHANGED, self)
294    
295      def TreeInfo(self):      def TreeInfo(self):
296          items = []          items = []
297    
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